Dempsie is a keen Nottingham Forest
football fan and attends many home and away matches, he appeared on
the UK Saturday morning football show Soccer AM wearing a Nottingham Forest
football shirt. He appeared alongside Skins
co-star Nicholas
Hoult.

In episode 6 of the fourth series of Doctor Who, "The
Doctor's Daughter", that aired on 10 May 2008, Dempsie played
the character Cline[1],
a soldier who watches his comrades die.[2] In
addition to this appearance, he conducted a small interview with Doctor Who
Magazine which appears on the final page of issue 396 (June
2008).